Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p>This example uses the HTML DOM to assign an "onkeyup" event to an input element.</p>

<p>Press a key inside the text field and release it to set the text to uppercase.</p>

Enter your name: <input type="text" id="fname">

<script>
document.getElementById("fname").onkeyup = function() {myFunction()};

function myFunction() {
    var x = document.getElementById("fname");
    x.value = x.value.toUpperCase();
}
</script>

</body>
</html>